back pain after eating

For the past few days, after I eat my back starts hurting. It's in the middle of my back. Could this be my kidneys? It's happens almost immediately after eating a meal. Sometimes it is accompanied by bad indigestion and/or headache. I am usually not prone to indigestion, and my diet has not changed.

I have the same thing and it is really quite distressing, I have no idea what it could be, but the pains are always on my pain, close to the spine, and in the area where my kidneys would be, about mid-back few inches lower. If anyone has figured out what this is, please let me know, I can only think that it IS my kidneys and that the urinalysis that I get just doesn't show anything wrong because they are not degraded enough. please let me know what you all think.